The Conservatives will intensify their warnings of the dangers of voting for Nick Clegg tomorrow night when they broadcast a mock election broadcast on behalf of the Hung Parliament party, which will pledge to "paralyse" Britain.

Amid concerns that Clegg's success in the polls will rob the Tories of the crucial seats they need to form a parliamentary majority, the party has launched a twin-track strategy to woo natural supporters who have been tempted to vote for the Liberal Democrats.

The Tories' broadcast features a tall, handsome Clegg lookalike. As nooses appear on the screen, the "party leader" stands in front of the House of Commons to pledge "behind closed doors politics" plus "indecision and weak government". The spoof party would guarantee a "dip in confidence", a run on the pound and "disastrous" hikes in interest rates that would "paralyse" UK plc. "A vote for any party other than the Conservatives should do the job," the Clegg figure advises. The broadcast also features a picture of Gordon Brown standing in Downing Street with the message: "This is what a hung parliament looks like."

The Tories hope to reprise their success in the 1992 election after Paddy Ashdown challenged Neil Kinnock to form a coalition with the Lib Dems in the event of a hung parliament. Ashdown's remarks prompted many natural Tories who had been leaning toward the Lib Dems to return to the fold.

In the second prong of the Tory offensive, David Cameron attempted to love-bomb Lib Dem voters earlier today. "If you care about the environment, if you care about civil liberties, if you want to get these changes done, then the modern Conservative party is there to help you get those changes done," he said.

The Tory leader was less warm about the Liberal Democrat party. "You can vote for those things while avoiding the crazy amnesty and policies on law and order and the complete muddle and confusion on the economy you have had from the Lib Dems in this election."

Cameron reiterated his opposition to a referendum on electoral reform – the demand that would be at the top of any Lib Dem shopping list if they hold the balance of power. But he declined to rule out discussing electoral reform in a hung parliament.